|Publication number||US5493071 A|
|Application number||US 08/337,564|
|Publication date||Feb 20, 1996|
|Filing date||Nov 10, 1994|
|Priority date||Nov 10, 1994|
|Also published as||CA2162521A1, CA2162521C, USRE37010|
|Publication number||08337564, 337564, US 5493071 A, US 5493071A, US-A-5493071, US5493071 A, US5493071A|
|Original Assignee||Berk-Tek, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (25), Non-Patent Citations (2), Referenced by (93), Classifications (7), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention generally relates to a communication cable for use in a plenum and, in particular, relates to one such communication cable having a first plurality of twisted pairs of electrical conductors having a first insulating material about each electrical conductor thereof and a second plurality of twisted pairs of electrical conductors having a second insulating material about each electrical conductor thereof.
As communications and communication services have increased, it has become necessary to provide communication cables in larger and larger numbers. This is particularly true in office buildings where more and mores communication services are being demanded. Typically, rather than rewire an existing building, it has been found more economical to provide the needed communication services by running the communication cables in plenums. In general, a plenum is defined as a compartment or chamber to which one or more air ducts are connected and which forms part of the air distribution system. Generally, in existing buildings, plenums are readily formed by providing drop ceilings, which is typically a return air plenum, in a facility being rewired. Another alternative is to create a plenum beneath a raised floor of a facility.
From the above it is readily understood why it would be very advantageous to utilized a wiring scheme within these fairly accessible places. However, since these plenums handle environmental air, considerable concern regarding a fire incidence is addressed in the National Electrical Code by requiring that communications cables for use in plenums pass a stringent flame and smoke evaluation. Consequently, in the manufacture of communication cables the fire resistance ratings which allow for installation within certain areas of a building are of primary importance.
Currently, communication cables for use in plenums must meet the requirements of the Underwriter's Laboratory Standard 910 which is a Test Method For Fire and Smoke Characteristics of Cables Used In Air-Handling Spaces. This is a well known test performed in a modified Steiner Tunnel. During the test, a single layer of 24 foot lengths of cable are supported on a one foot wide cable rack which is filled with cables. The cables are ignited with a 300,000 Btu/hr methane flame located at one end of the furnace for a duration of 20 minutes. Flame spread is aided by a 240 ft/minute draft. Flame spread is then monitored through observation windows along the side of the tunnel while concurrently monitoring smoke emissions through photocells installed within the exhaust duct. This is a severe test that to date has been passed by communication cables using premium materials such as low smoke materials, for example, Fluroethylenepropylene (FEP), Ethylenechlorotrifluoroethylene (ECTFE), or Polyvinylidene fluoride (PVDF). In general, cables meeting this test are approximately three times more expensive than a lower rated cable designed for the same application. However, communication cables failing this test must be installed within conduit, thereby eliminating the benefits of an economical, easily relocatable cable scheme.
In general, the manufacture of communication cables are well known, for example, U.S. Pat. No. 4,423,589, issued to Hardin et al. on Jan. 3, 1984 discloses a method of manufacturing a communications cable by forming a plurality of wire units by advancing groups of twisted wire pairs through twisting stations. Further, U.S. Pat. No. 4,446,689 issued to Hardin et al. on May 8, 1984 relates to an apparatus for manufacturing a communications cable wherein disc frames are provided with aligned apertures in which faceplates movably mounted. During operation, the faceplates are modulated in both frequency and amplitude.
The current materials for use in communications are also well known, for example, U.S. Pat. No. 5,001,304 issued to Hardin et al. on Mar. 19, 1991 relates to a building riser cable having a core which includes twisted pairs of metal conductors. Therein the insulating covers are formed from a group of materials including polyolefin. It should be noted however, that all of the insulating covers are the same and that the flame test used for riser cables is much less severe than the flame test used for plenum cables.
U.S. Pat. No. 5,024,506 issued to Hardin et al. on Jun. 18, 1991 discloses a plenum cable that includes non-halogenated plastic materials. The insulating material about the metallic conductors is a polyetherimide. Again the insulating material is the same for all of the conductors. Further, in U.S. Pat. No. 5,074,640 issued to Hardin et al. on Dec. 24, 1991 a plenum cable is described that includes an insulator containing a polyetherimide and an additive system including an antioxidant/thermal stabilizer and a metal deactuator. As is the convention, the insulator is the same for all of the metallic conductors.
U.S. Pat. No. 5,202,946 issued to Hardin et al. on Apr. 13, 1993 describes a plenum cable wherein the insulation includes a plastic material. The insulation is the same for all of the conductors within the plenum cable. European Patent 0 380 245 issued to Hardin et al. describes another plenum cable having insulation about the metallic conductors that, in this case, is a plastic material including a polyetherimide. As is the convention the insulation is the same for all of the conductor.
Further, U.S. Pat. No. 4,941,729 describes a cable that is intended as a low hazard cable. This patent describes a cable that includes a non-halogenated plastic material. Similarly, U.S. Pat. No. 4,969,706 describes a cable that includes both halogenated and non-halogenated plastic materials. In both patents the insulating material about the twisted pairs of conductors is the same for each cable.
U.S. Pat. No. 4,412,094 issued to Doughrety et al. on Oct. 25, 1983 relates to a riser cable having a composite insulator having an inner layer of expanded polyethylene and an outer layer of a plasticized polyvinyl chloride. All of the conductors include the same composite insulator.
U.S. Pat. No. 4,500,748 issued to Klein on Feb. 19, 1985 relates to a flame retardant plenum cable wherein the insulation and the jacket are made from the same or different polymers to provide a reduced amount of halogens. This reference tries to predict, mathematically, the performance of cables within the Steiner tunnel. The method does not include fuel contributions or configurations of designs. Further, synergistic effects are not addressed. In each embodiment, the insulation is the same for all of the conductors.
U.S. Pat. No. 4,605,818 issued to Arroyo et al. on Aug. 12, 1986 relates to a flame retardant plenum cable wherein the conductor insulation is a polyvinyl chloride plastic provided with a flame retardant, smoke suppressive sheath system. As is common throughout the known communication cables the conductor insulation is the same for all of the conductors.
U.S. Pat. No. 4,678,294 issued to Angeles on Aug. 18, 1987 relates to a fiber optic plenum cable. The optical fibers are provided with a buffer layer surrounded by a jacket. The cable is also provided with strength members for rigidity.
U.S. Pat. No. 5,010,210 issued to Sidi et al. on Apr. 23, 1991 describes a non-plenum telecommunications cable wherein the insulation surrounding each of the conductors is formed from a flame retardant polyolefin base compound.
U.S. Pat. No. 5,162,609 issued to Adriaenssens et al. on Nov. 10, 1992 relates to a fire-resistant non-plenum cable for high frequency signals. Each metallic member has an insulation system. The insulation system includes an inner layer of a polyolefin and an outer layer of flame retardant polyolefin plastic.
U.S. Pat. No. 5,253,317 issued to Allen et al. on Oct. 12, 1993 describes a non-halogenated plenum cable including twisted pairs of insulated metallic conductors. The insulating material is a non-halogenated sulfone polymer composition. The insulating material is the same for all of the metallic conductors.
It can thus be understood that much work has been dedicated to providing not only communication cables that meet certain safety requirements but meet electrical requirements as well. Nevertheless, the most common communication cable that is in widest use today includes a plurality of twisted pairs of electrical conductors each having an insulation of FEP, which is a very high temperature material and possesses those electrical characteristics, such as, low dielectric constant and dissipation factor, necessary to provide high quality communications cable performance. However, FEP is quite expensive and is frequently in short supply.
Consequently, the provision of a communication cable for use in plenums but has a reduced cost and reduced use of FEP is highly desired.
Accordingly, it is one object of the present invention to provide a communication cable for use in a plenum which reduces the amount of FEP or other expensive materials and hence, reduces the cost of the communication cable.
This object is accomplished, at least in part by the a communication cable that has a first plurality of twisted pairs of electrical conductors having a first insulating material about each electrical conductor thereof and a second plurality of twisted pairs of electrical conductors having a second insulating material about each electrical conductor thereof.
In one particular aspect of the invention, the communication cable includes four twisted pairs of electrical conductors wherein the electrical conductor of three of the four pairs are insulated with a material that is a plenum rated material wherein the insulation of the electrical conductors of the fourth pair is a modified non-plenum rated insulation material. As used herein the phrase "plenum rated insulation" includes those materials that would allow a cable to pass standard industry plenum tests if it were used on all of the twisted pairs of electrical conductors of a cable. Correspondingly, the phrase "non-plenum rated" insulation includes those materials that would significantly contribute to a cable failing standard industry plenum tests if it were used on all of the twisted pairs of electrical conductors of a cable. Typically, these non-plenum materials provide too much fuel contribution to the flame test either through a low melting point or a high fuel content or a combination of these factors. Non-plenum materials may also contribute excessively to the smoke generation of the cable under test, thus rendering the cable unsuitable for plenum applications. In such a communication cable the insulation material can be an olefin which is a material usually reserved for use in non-plenum application, for example, in riser cables.
In another aspect of the invention, the communication cable includes a first plurality of twisted pairs of electrical conductors wherein the insulation material of each of the first plurality of twisted pairs of conductors is a material conventionally used in plenum cables. In this aspect of the invention, the communication cable also includes a second plurality of twisted pairs of conductors having an insulation that is different from the insulation of the first plurality of twisted pairs of electrical conductors. The number of pairs in the second plurality of twisted pairs being no greater than the number of twisted pairs of the first plurality of electrical conductors.
Other objects and advantages will become apparent to those skilled in the art from the following detailed description of the invention read in conjunction with the appended claims and the drawings attached hereto.
The drawings, not drawn to scale, include:
FIG. 1 which is a perspective view of a communication cable embodying the principles of the present invention; and
FIG. 2 which is an end view of another communication cable also embodying the principles of the present invention.
A communication cable, generally indicated at 10 in FIG. 1 and embodying the principles of the present invention, includes a plurality of twisted pairs 12 of electrical conductors each member 14 of the twisted pairs 12 being surrounded by a layer 16 of insulation material and at least one other twisted pair 18 of electrical conductors each member 20 thereof surrounded by a layer 22 of insulation material that is different from the material of the layer 16 of insulation material of the twisted pairs 12. In one preferred embodiment, the plurality of twisted pairs 12 and the twisted pair 18 are surrounded by a cable jacket 24.
In one particular embodiment, each of the twisted pairs, 12 and 18, is provided with a twist length. In an embodiment wherein the communication cable 10 includes four twisted pairs, one or two of the twisted pairs are twisted pairs be having a layer 22 of insulation material different from the other twisted pairs 12 of electrical conductors.
In one specific embodiment, the communication cable includes three insulated twisted pairs 12 of electrical conductors each having a nominal diameter of about 0.034 inches. This includes an electrical conductor having a nominal diameter of about 0.0201 inches and a layer 16 of insulation having a thickness of about 0.0065 inches. For these twisted pairs 12 of electrical conductors the layer 16 of insulation can be any plenum rated insulation, such as, for example, FEP. In this embodiment, each of the insulated twisted pair 18 of electrical conductors has a nominal diameter of about 0,205 inches and a layer 22 of insulating material having a thickness of about 0.0085 inches.
Preferably, the layer 22 of insulation material of the twisted pair 18 is a modified non-plenum material. For example, such an insulation material 22 may be a combination of highly brominated and antimony trioxide filled high density polyethylene (HDPE) combined with standard HDPE. As another example, the insulation layer 22 may also be a hydrated mineral filled polyolefin copolymer blended with HDPE. Although other combinations can be used it is preferred that the combination is blended at a 50/50 to 75/25 blend ratio of the flame retarded HDPE to the standard HDPE. Such combinations improve the flame retardancy and smoke suppression of the material as well as reduces the fuel load by removing HDPE while maintaining electrical performance. Two such cables have successfully passed the Steiner tunnel test.
It has also been found that such a configuration does not compromise the desired electrical performance of the communication cable 10 due to the very good electrical and mechanical properties of the base olefin material. In fact, for the embodiment discussed above, the standard FEP four pair cable has a weakness in the typical design in that the twisted pair having the shortest twist length, i.e., the tightest twist, generally approaches the signal attenuation failure limit. Usually this is within about 2% of the passing level. Hence, any process changes must be limited on this twisted pair to avoid any distortional stresses during manufacture that would lower the characteristic impedance of the twisted pair and thus raise the signal attenuation. It has been found that when this twisted pair is provided with the modified olefin insulation material the signal attenuation is improved due to the added ruggedness of olefin material compared to the standard FEP insulation.
In the preferred embodiment, the communication cable 10 includes a cable jacket 24 that encases the plurality of twisted pairs 12 and the at least one twisted pair 18. Preferably, the cable jacket 24 is formed from Ethylene-Trichlorofluoroethylene (E-CTFE). Although the E-CTFE is preferred, other material, such as, for example, polyvinylchloride (PVC) or polymer alloys have also passed the modified Steiner tunnel test and may also be used.
Another communication cable, generally indicated at 26 in FIG. 2 and embodying the principles of the present invention, includes a first plurality of twisted pairs 28 of electrical conductors having a first insulating material 30 about each electrical conductor thereof and a second plurality of twisted pairs 32 of electrical conductors having a second insulating material 34 about each electrical conductor thereof. Further, the second plurality of twisted pairs 32 is no greater than half of the total number of twisted pairs. For example, in a typically communication cable 26 wherein there is a total of about 25 twisted pairs of electrical conductors no more than twelve will constitute the second plurality of twisted pairs 32. The communication cable 26 also includes a cable jacket 36 that encases the first and second plurality of twisted pairs, 28 and 34, respectively. The cable jacket 36 is similar to the cable jacket 24 of the communication cable 10 previously described hereinabove and can be formed of the same materials.
Although the present invention has been discussed with respect to one or more specific embodiments it will be understood that other configurations and arrangements may be used which do not exceed the spirit and scope hereof. Hence, the present invention is limited only by the appended claims and the reasonable interpretation thereof.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3433890 *||Feb 7, 1967||Mar 18, 1969||Communications Patents Ltd||Signal transmission cable|
|US3678177 *||Mar 29, 1971||Jul 18, 1972||British Insulated Callenders||Telecommunication cables|
|US4408443 *||Nov 5, 1981||Oct 11, 1983||Western Electric Company, Inc.||Telecommunications cable and method of making same|
|US4412094 *||Jul 28, 1981||Oct 25, 1983||Western Electric Company, Inc.||Compositely insulated conductor riser cable|
|US4423589 *||Feb 2, 1981||Jan 3, 1984||Western Electric Company, Inc.||Telecommunication cables and methods of manufacturing same|
|US4446689 *||Jan 31, 1983||May 8, 1984||At&T Technologies, Inc.||Telecommunication cables|
|US4500748 *||Apr 8, 1983||Feb 19, 1985||Eaton Corporation||Flame retardent electrical cable|
|US4605818 *||Jun 29, 1984||Aug 12, 1986||At&T Technologies, Inc.||Flame-resistant plenum cable and methods of making|
|US4687294 *||May 25, 1984||Aug 18, 1987||Cooper Industries, Inc.||Fiber optic plenum cable|
|US4697051 *||Jul 31, 1985||Sep 29, 1987||At&T Technologies Inc., At&T Bell Laboratories||Data transmission system|
|US4755629 *||Sep 24, 1986||Jul 5, 1988||At&T Technologies||Local area network cable|
|US4873393 *||Mar 21, 1988||Oct 10, 1989||American Telephone And Telegraph Company, At&T Bell Laboratories||Local area network cabling arrangement|
|US4941729 *||Jan 27, 1989||Jul 17, 1990||At&T Bell Laboratories||Building cables which include non-halogenated plastic materials|
|US4969706 *||Apr 25, 1989||Nov 13, 1990||At&T Bell Laboratories||Plenum cable which includes halogenated and non-halogenated plastic materials|
|US5001304 *||Jul 25, 1989||Mar 19, 1991||At&T Bell Laboratories||Building riser cable|
|US5010210 *||Jun 21, 1990||Apr 23, 1991||Northern Telecom Limited||Telecommunications cable|
|US5024506 *||Dec 21, 1989||Jun 18, 1991||At&T Bell Laboratories||Plenum cables which include non-halogenated plastic materials|
|US5074640 *||Dec 14, 1990||Dec 24, 1991||At&T Bell Laboratories||Cables which include non-halogenated plastic materials|
|US5162609 *||Jul 31, 1991||Nov 10, 1992||At&T Bell Laboratories||Fire-resistant cable for transmitting high frequency signals|
|US5173960 *||Mar 6, 1992||Dec 22, 1992||At&T Bell Laboratories||Cable having superior resistance to flame spread and smoke evolution|
|US5202946 *||Feb 20, 1992||Apr 13, 1993||At&T Bell Laboratories||High count transmission media plenum cables which include non-halogenated plastic materials|
|US5253317 *||Nov 21, 1991||Oct 12, 1993||Cooper Industries, Inc.||Non-halogenated plenum cable|
|US5298680 *||Aug 7, 1992||Mar 29, 1994||Kenny Robert D||Dual twisted pairs over single jacket|
|US5378856 *||Dec 11, 1992||Jan 3, 1995||Belden Wire & Cable Company||Transmission cable having a nonhalogenated jacket formulation|
|EP0380245A1 *||Jan 18, 1990||Aug 1, 1990||AT&T Corp.||Plenum cables which include non-halogenated plastic materials|
|1||*||Underwriter s Laboratory Standard 910 Paper.|
|2||Underwriter's Laboratory Standard 910 Paper.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5619016 *||Jan 31, 1995||Apr 8, 1997||Alcatel Na Cable Systems, Inc.||Communication cable for use in a plenum|
|US5739473 *||Jul 31, 1995||Apr 14, 1998||Lucent Technologies Inc.||Fire resistant cable for use in local area network|
|US5744757 *||May 3, 1996||Apr 28, 1998||Belden Wire & Cable Company||Plenum cable|
|US5767441 *||Jan 4, 1996||Jun 16, 1998||General Cable Industries||Paired electrical cable having improved transmission properties and method for making same|
|US5770820 *||May 7, 1996||Jun 23, 1998||Belden Wire & Cable Co||Plenum cable|
|US5814768 *||Dec 11, 1996||Sep 29, 1998||Commscope, Inc.||Twisted pairs communications cable|
|US5821466 *||Dec 23, 1996||Oct 13, 1998||Cable Design Technologies, Inc.||Multiple twisted pair data cable with geometrically concentric cable groups|
|US5834697 *||Aug 1, 1996||Nov 10, 1998||Cable Design Technologies, Inc.||Signal phase delay controlled data cables having dissimilar insulation materials|
|US5841073 *||Sep 5, 1996||Nov 24, 1998||E. I. Du Pont De Nemours And Company||Plenum cable|
|US5898133 *||Feb 27, 1996||Apr 27, 1999||Lucent Technologies Inc.||Coaxial cable for plenum applications|
|US5932847 *||May 10, 1996||Aug 3, 1999||Remee Products Corporation||Flame retardant plenum cable|
|US5969295 *||Jan 9, 1998||Oct 19, 1999||Commscope, Inc. Of North Carolina||Twisted pair communications cable|
|US6063496 *||Jun 4, 1998||May 16, 2000||Judd Wire, Inc.||Polyamide coating compositions having a balance of resistance properties|
|US6064008 *||Feb 12, 1997||May 16, 2000||Commscope, Inc. Of North Carolina||Conductor insulated with foamed fluoropolymer using chemical blowing agent|
|US6096977 *||Sep 4, 1998||Aug 1, 2000||Lucent Technologies Inc.||High speed transmission patch cord cable|
|US6124551 *||Apr 26, 1999||Sep 26, 2000||Adaptec, Inc.||Ultra thin and flexible SCSI cable and method for making the same|
|US6139957 *||Aug 28, 1998||Oct 31, 2000||Commscope, Inc. Of North Carolina||Conductor insulated with foamed fluoropolymer and method of making same|
|US6153826 *||May 28, 1999||Nov 28, 2000||Prestolite Wire Corporation||Optimizing lan cable performance|
|US6162992 *||Mar 23, 1999||Dec 19, 2000||Cable Design Technologies, Inc.||Shifted-plane core geometry cable|
|US6194663 *||Feb 28, 1997||Feb 27, 2001||Lucent Technologies Inc.||Local area network cabling arrangement|
|US6218621 *||Jun 1, 1998||Apr 17, 2001||Alcatel||High-frequency data transmission cable and method and apparatus for fabricating it|
|US6231919||May 24, 2000||May 15, 2001||Commscope Properties, Llc||Method of making conductor insulated with foamed fluoropolymer|
|US6248954||Feb 25, 1999||Jun 19, 2001||Cable Design Technologies, Inc.||Multi-pair data cable with configurable core filling and pair separation|
|US6254924||Jan 8, 1998||Jul 3, 2001||General Cable Technologies Corporation||Paired electrical cable having improved transmission properties and method for making same|
|US6271472 *||Apr 25, 2000||Aug 7, 2001||Adaptec, Inc.||Ultra thin and flexible SCSI cable and method for making same|
|US6286294||Nov 2, 1999||Sep 11, 2001||Kinrei Machinery Co., Ltd.||Wire stranding machine|
|US6303867||Aug 29, 2000||Oct 16, 2001||Cable Design Technologies, Inc.||Shifted-plane core geometry cable|
|US6318062||Nov 13, 1998||Nov 20, 2001||Watson Machinery International, Inc.||Random lay wire twisting machine|
|US6323427||May 25, 2000||Nov 27, 2001||Krone, Inc.||Low delay skew multi-pair cable and method of manufacture|
|US6333465 *||Nov 23, 1998||Dec 25, 2001||Alcatel||Data transmission cable|
|US6365838 *||May 25, 2000||Apr 2, 2002||Krone, Inc.||Tuned patch cable|
|US6555753||Jan 23, 2002||Apr 29, 2003||Krone, Inc.||Tuned patch cable|
|US6570095||May 11, 2001||May 27, 2003||Cable Design Technologies, Inc.||Multi-pair data cable with configurable core filling and pair separation|
|US6608255 *||May 22, 1997||Aug 19, 2003||Avaya Technology Corp.||Local area network cabling arrangement having improved capacitance unbalance and structural return loss|
|US6800811||Jun 9, 2000||Oct 5, 2004||Commscope Properties, Llc||Communications cables with isolators|
|US6812408||May 28, 2003||Nov 2, 2004||Cable Design Technologies, Inc.||Multi-pair data cable with configurable core filling and pair separation|
|US6998537||Jan 3, 2003||Feb 14, 2006||Belden Cdt Networking, Inc.||Multi-pair data cable with configurable core filling and pair separation|
|US7015397||May 27, 2003||Mar 21, 2006||Belden Cdt Networking, Inc.||Multi-pair communication cable using different twist lay lengths and pair proximity control|
|US7019218 *||Aug 18, 2004||Mar 28, 2006||Rgb Systems, Inc.||UTP cable apparatus with nonconducting core, and method of making same|
|US7030321||Jul 28, 2004||Apr 18, 2006||Belden Cdt Networking, Inc.||Skew adjusted data cable|
|US7078626 *||Mar 12, 2004||Jul 18, 2006||Rgb Systems, Inc.||Cable apparatus for minimizing skew delay of analog signals and cross-talk from digital signals and method of making same|
|US7109424||Jul 9, 2004||Sep 19, 2006||Panduit Corp.||Alien crosstalk suppression with enhanced patch cord|
|US7115815||Dec 26, 2003||Oct 3, 2006||Adc Telecommunications, Inc.||Cable utilizing varying lay length mechanisms to minimize alien crosstalk|
|US7135641||Aug 4, 2005||Nov 14, 2006||Belden Technologies, Inc.||Data cable with cross-twist cabled core profile|
|US7154043||Nov 10, 2003||Dec 26, 2006||Belden Technologies, Inc.||Data cable with cross-twist cabled core profile|
|US7179999||Feb 13, 2006||Feb 20, 2007||Belden Technologies, Inc.||Multi-pair data cable with configurable core filling and pair separation|
|US7208683||Jan 28, 2005||Apr 24, 2007||Belden Technologies, Inc.||Data cable for mechanically dynamic environments|
|US7214884||Dec 26, 2003||May 8, 2007||Adc Incorporated||Cable with offset filler|
|US7220918||Mar 24, 2005||May 22, 2007||Adc Incorporated||Cable with offset filler|
|US7220919||Mar 24, 2005||May 22, 2007||Adc Incorporated||Cable with offset filler|
|US7244893||Jun 7, 2004||Jul 17, 2007||Belden Technologies, Inc.||Cable including non-flammable micro-particles|
|US7271343||Feb 1, 2006||Sep 18, 2007||Belden Technologies, Inc.||Skew adjusted data cable|
|US7271344||Mar 9, 2006||Sep 18, 2007||Adc Telecommunications, Inc.||Multi-pair cable with channeled jackets|
|US7329815||Jul 19, 2005||Feb 12, 2008||Adc Incorporated||Cable with offset filler|
|US7375284||Jun 21, 2006||May 20, 2008||Adc Telecommunications, Inc.||Multi-pair cable with varying lay length|
|US7405360||Feb 9, 2007||Jul 29, 2008||Belden Technologies, Inc.||Data cable with cross-twist cabled core profile|
|US7449638||Dec 8, 2006||Nov 11, 2008||Belden Technologies, Inc.||Twisted pair cable having improved crosstalk isolation|
|US7491888||Oct 23, 2006||Feb 17, 2009||Belden Technologies, Inc.||Data cable with cross-twist cabled core profile|
|US7498518||Dec 26, 2006||Mar 3, 2009||Adc Telecommunications, Inc.||Cable with offset filler|
|US7534964||Jun 20, 2008||May 19, 2009||Belden Technologies, Inc.||Data cable with cross-twist cabled core profile|
|US7550676||May 15, 2008||Jun 23, 2009||Adc Telecommunications, Inc.||Multi-pair cable with varying lay length|
|US7629536||Aug 10, 2007||Dec 8, 2009||Adc Telecommunications, Inc.||Multi-pair cable with channeled jackets|
|US7696437||Sep 21, 2007||Apr 13, 2010||Belden Technologies, Inc.||Telecommunications cable|
|US7696438||Jan 8, 2009||Apr 13, 2010||Belden Technologies, Inc.||Data cable with cross-twist cabled core profile|
|US7718896 *||Mar 21, 2008||May 18, 2010||Ls Cable Ltd.||Communication cable of high capacity|
|US7728228||Aug 31, 2006||Jun 1, 2010||Panduit Corp.||Alien crosstalk suppression with enhanced patchcord|
|US7875800||Feb 27, 2009||Jan 25, 2011||Adc Telecommunications, Inc.||Cable with offset filler|
|US8198536||Oct 7, 2008||Jun 12, 2012||Belden Inc.||Twisted pair cable having improved crosstalk isolation|
|US8357855||Apr 18, 2010||Jan 22, 2013||Ls Cable & System Ltd.||Communication cable of high capacity|
|US8367933||Jun 18, 2010||Feb 5, 2013||Superior Essex Communications Lp||Data cables with improved pair property balance|
|US8375694||Jan 17, 2011||Feb 19, 2013||Adc Telecommunications, Inc.||Cable with offset filler|
|US8704094 *||Mar 8, 2011||Apr 22, 2014||Superior Essex International LP||Twisted pair data cable|
|US8916773 *||May 21, 2013||Dec 23, 2014||Young Il MOK||High conductivity wire and method of manufacturing the same|
|US20040074668 *||May 16, 2003||Apr 22, 2004||Steve Somers||Cable for minimizing skew delay and crosstalk|
|US20040149484 *||May 27, 2003||Aug 5, 2004||William Clark||Multi-pair communication cable using different twist lay lengths and pair proximity control|
|US20050023028 *||Jun 7, 2004||Feb 3, 2005||Clark William T.||Cable including non-flammable micro-particles|
|US20050029007 *||Jul 9, 2004||Feb 10, 2005||Nordin Ronald A.||Alien crosstalk suppression with enhanced patch cord|
|US20050045367 *||Aug 18, 2004||Mar 3, 2005||Somers Steve L.||UTP cable apparatus with nonconducting core, and method of making same|
|US20050056454 *||Jul 28, 2004||Mar 17, 2005||Clark William T.||Skew adjusted data cable|
|US20050092514 *||Dec 26, 2003||May 5, 2005||Robert Kenny||Cable utilizing varying lay length mechanisms to minimize alien crosstalk|
|US20050092515 *||Dec 26, 2003||May 5, 2005||Robert Kenny||Cable with offset filler|
|US20050167151 *||Mar 24, 2005||Aug 4, 2005||Adc Incorporated||Cable with offset filler|
|US20050199416 *||Mar 12, 2004||Sep 15, 2005||Somers Steve L.||Cable apparatus for minimizing skew delay of analog signals and cross-talk from digital signals and method of making same|
|US20050205289 *||Mar 24, 2005||Sep 22, 2005||Adc Incorporated||Cable with offset filler|
|US20050247479 *||Jul 19, 2005||Nov 10, 2005||Adc Incorporated||Cable with offset filler|
|US20050269125 *||Aug 4, 2005||Dec 8, 2005||Belden Cdt Networking, Inc.||Data cable with cross-twist cabled core profile|
|US20110114361 *||May 14, 2010||May 19, 2011||Mok Young Il||High conductivity wire and method of manufacturing the same|
|US20110174516 *||Sep 25, 2009||Jul 21, 2011||Jong-Seb Baeck||Data communication cable|
|US20130248223 *||May 21, 2013||Sep 26, 2013||Young Il MOK||High Conductivity Wire And Method Of Manufacturing The Same|
|WO1997017707A1 *||Oct 7, 1996||May 15, 1997||Pak Il Young||Cord and heating wire|
|WO1998010434A1 *||Sep 2, 1997||Mar 12, 1998||Du Pont||Plenum cable|
|WO2000016988A1 *||Sep 21, 1999||Mar 30, 2000||R H Consulting Inc||Lithographic printing plates for use with laser imaging apparatus|
|WO2000074078A1 *||May 25, 2000||Dec 7, 2000||Prestolite Wire Corp||Low delay skew multi-pair cable and method of manufacture|
|U.S. Classification||174/113.00R, 174/110.0FC, 174/34, 174/121.00A|
|Apr 27, 1995||AS||Assignment|
Owner name: BERK-TEK, INC., PENNSYLVANIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEWMOYER, KERRY;REEL/FRAME:007443/0794
Effective date: 19950412
|May 23, 1996||AS||Assignment|
Owner name: ALCATEL NA CABLE SYSTEMS, INC., NORTH CAROLINA
Free format text: MERGER;ASSIGNOR:BERK-TEK, INC.;REEL/FRAME:007961/0837
Effective date: 19951215
|Aug 27, 1996||CC||Certificate of correction|
|Dec 3, 1996||RF||Reissue application filed|
Effective date: 19960822
|Aug 16, 1999||FPAY||Fee payment|
Year of fee payment: 4